TORONTO – This is what’s known as pent-up demand.TSN announced Thursday that its opening night NHL broadcast Wednesday featuring Ottawa @ Toronto (nationally, excluding Alberta) and Calgary @ Minnesota (regionally in Alberta), attracted a record national audience of 2.1 million viewers, making it the most watched NHL telecast ever on TSN and the third most watched program of all time on TSN. The figures here are all from Nielsen Media Research, released by TSN. The audience average more than doubles the previous NHL regular season record. The telecast peaked at 2.7 million viewers from 10:30 p.m. to 10:50 p.m. ET...